Including GUT Tests Post other test completion

[FeralBytes]

I have encountered several bugs in GDScript as the language continues to be improved. I know that it is better to test at the C level, but it is much easier and usually still accurate to (with valid tests) to test using GDScript, at least to ensure consistent behavior. I would like to add GUT to your project as a PR if you are willing to accept so that we can slowly add some GDScript regression tests to be run after the other tests. What are your thoughts on this? If not I will maintain it on my project any ways. But I like the idea of the tests being run more often on the master branch. Thank you for your consideration.